/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 ***************************************************************************************
 */
package com.espertech.esper.epl.agg.service;

import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.epl.agg.access.AggregationAccessorSlotPair;
import com.espertech.esper.epl.core.EngineImportService;

/**
 * Aggregation service for use when only first/last/window aggregation functions are used an none other.
 */
public class AggSvcGroupByAccessOnlyFactory implements AggregationServiceFactory {
    private final AggregationAccessorSlotPair[] accessors;
    private final AggregationStateFactory[] accessAggSpecs;
    private final boolean isJoin;

    /**
     * Ctor.
     *
     * @param accessors      accessor definitions
     * @param accessAggSpecs access aggregations
     * @param isJoin         true for join, false for single-stream
     */
    public AggSvcGroupByAccessOnlyFactory(AggregationAccessorSlotPair[] accessors,
                                          AggregationStateFactory[] accessAggSpecs,
                                          boolean isJoin) {
        this.accessors = accessors;
        this.accessAggSpecs = accessAggSpecs;
        this.isJoin = isJoin;
    }

    public AggregationService makeService(AgentInstanceContext agentInstanceContext, EngineImportService engineImportService, boolean isSubquery, Integer subqueryNumber) {
        return new AggSvcGroupByAccessOnlyImpl(accessors, accessAggSpecs, isJoin);
    }
}